Burglar-alarm



F. E. SPARKS.

BURGLAR ALARM. APPLICATION FILED MAY 16. 1921.

Patented Nov. 22, 1921.

UNITED STATES PATENT OFFER.

FRED E. SPARKS, OF AKRON, OHIO, ASSIGNOR TO AUTOMATEC BULRGLAR ALARM COMPANY, OF CHARLESTON. WEST VIRGINIA, A CORPORATION OF WEST VIR- GINIA.

BUBGLAR-ALARM.

Application filed May 16,

To all whom it may concern: r

Be it known that I, From SPARKS, a citizen or the United States,v residing at Akron, in the county of Summit and State of Ohio, have invented new and useful Improvements in a Burglar-Alarm, or which the following is a specification.

This invention relates to alarm devices, and more particularly to a burglar alarm specially adapted for use in connection with windows.

One oi the main objects of the invention is to provide a device of the character stated or simple construction and operation which may be readily applied to a window of standard construction without necessitating any changes whatever in the construction of the window. A further objectis to provide a device of this character which may be applied directly to the window sash and will permit the sash to be adjusted as desired, the device being operative at any adjusted position of the sash. A further object is to provide simple and efficient means for rendering the device inoperative. Further objects will appear from the detailed description.

In the drawings Figure 1 is a front view of the device as applied;

Fig. 2 i a side view of the same;

Fig. 3 is a side view taken from the opposite side to Fig. 2 showing the device in inoperative position;

Fig. 4: is a top plan view of the bell with the upper section of the casing removed.

A substantially L-shaped bracket 1 is secured to top rail 2 of lower sash 3 of the window. A rectangular arm a is secured to vertical arm 1 of bracket 1 and rotatably supports a bell 5 or" a known type. This bell includes a casing consisting of an upper section 6 and a lower section 7. .Vithin section 7 there is a supplemental casing 8 within which is positioned a spring motor adapted to be wound by an arbor 9 upon which upper section 6 of the bell casing is threaded. The spring motor operates through suitable connections to reciprocate a hammer or striker 10 which is adapted to strike the upper section of the bell casing thus ringing the same. Supporting arm 11 0t striker 10 is normally held against reciprocation by a finger 12 which projects through an opening 13 in the top plate of Specification of Letters Patent.

1921. Serial No. 469,979.

supplemental casing 8, this linger being normally held pressed outwardly by a spring, in a known manner. A button 1 1 extends outwardly from finger 12 for forcing the same inwardly, in a manner to be described, so as to release arm 11. of striker 10.

Two arcuate pla es or strips 15 are se: cured to the inner face or the peripheral wall oi section 7 of the bell casing, these strips having their ends spaced apart to leave spaces 16 within one of which the button 14; is normally positioned so as to prevent ringing of the bell. The ends of strips 15 are beveled so as to pass outside of the head of button lat upon relative rotation of casing section '7 thus forcing the button inwardly and releasing the striker so as to causev ringing of the bell.

The casing 8 which contains the spring motor for operating the bell is fixedly sccured on pin 1? which is secured through plate 4? of arm 1, section 7 of the casing being mounted for rotation upon this pin and about casing 8. A suitable covering 18 of rubber or other suitable material is secured about casing section 7, and this covering is normally held. by arm 1 of bracket 1 in close contact with the inner face of side rail 19 of the upper window sash 20. TVith the parts in the positions illustrated in Figs. 1 and 2 it will be evident that any appreciable movement of either sash in either direction will cause rotation of section 7 of the bell casing thus causing ringing of the bell and giving an alarm.

To permit movement ot' the device into inoperative position I provide an arm 21 of substantially crescent shape which is pivoted at 22 on arm 1, and is provided above the pivot with an extension forming a locking and releasing element 23. This element is adapted for engagement into a recess 24 formed in one edge of arm 1 of bracket 1, or to engage over the upper end portion of arm 1" after arm 21 has been forced clownwardly against the lower arm of bracket 1 so as to secure the bell in position out of contact with rail 19. As will be understood, when the device is in operative position, arm 21 is raised element 23 being positioned within recess 24 and the bell held in contact with rail 19 by arm 1.

An alarm constructed in this manner may be readily applied to a window of standard construction without necessitating any changes whatever in the construction of the window, and may be readily moved into or out of operative position as desired.

What I claim is 1. In combination with an upper window sash and a lower window sash, a bell including a casing having a section rotatably mounted on said lower sash and contacting with the upper sash, a control button, means associated with said button for preventing operation of the ringing mechanism of the bell when the button is extended and for releasing the ringing mechanism when-said button is forced inwardly of the casing, and operating strips secured to the inner peripheral wall of the rotatably mounted section of the bell casing and adapted to force the button inwardly of said casing upon rotation of said rotatably mounted section.

2. In an alarm bell, a casing including a rotatable lower section, a supplemental casing fixedly mounted withinsaid section, bell ringing mechanism carried by'said supplemental casing, a control button, means cooperating with said button for rendering the bell ringing mechanism inoperative when the button is projected, said button being normally projected, and means carried by said rotatably mounted section for forcing the button inwardly so as to release the bell ringing mechanism when said section} is rotated.

In testimony whereof, I afiix my si nature.

FRED E. sPAiiKs. 

